Room-temperature solid solution softening in Fe-V binary system

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• 作者：Jihye Park ; Jae-Hyeok Shim ; Young-Kook Lee
• 关键词：computer simulation ; dislocation ; alloys ; solid solution softening ; molecular dynamics
• 刊名：Metals and Materials International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：22
• 期：1
• 页码：7-11
• 全文大小：392 KB
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• 作者单位：Jihye Park (1) (2)
  Jae-Hyeok Shim (2)
  Young-Kook Lee (1)
  
  1. Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Korea
  2. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, 02792, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149

文摘

Molecular dynamics simulations of the glide of an edge dislocation in the bcc matrix of Fe-V alloys were performed to investigate the room-temperature solid solution softening by V atoms. For this purpose, the glide velocity of an edge dislocation was calculated as a function of V concentration under the shear stresses of 100-300MPa using the Fe-V cross-potential constructed newly in the present study. Whereas the solid solution hardening occurred as the V concentration is less than 0.13 at% or more than 0.5 at%, the room-temperature solid solution softening was observed in Fe-(0.13-0.5) at% V alloys. The solid solution softening occurring in Fe-(0.13-0.5) at% V alloys was caused by the accelerated growth velocity of kinks by solute V atoms. The increase in kink velocity happened when the interatomic distance between solute V atoms was similar to the length of dislocation kinks. Keywords computer simulation dislocation alloys solid solution softening molecular dynamics